Concept
The angles between the two sides 2ft and 3ft is a right angle, hence we can apply the Pythagoras theorem to find the length of the longest diagonal.
Step 1: Name all the sides
Opposite = 2 ft
Adjacent = 3 ft
Hypotenuse = x ft
Step 2: Apply the Pythagoras theorem below to find x.
![\begin{gathered} \text{Opposite}^2+Adjacent^2=Hypotenuse^2 \\ 2^2+3^2=x^2 \\ 4+9=x^2 \\ 13=x^2 \\ F\text{ind the square root of both sides.} \\ \sqrt[]{13}\text{ = }\sqrt[]{x^2} \\ 3.6\text{ = x} \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/srk7ig77ael4qb5otg9sgs8z45wml4pdjd.png)
Step 3: Final answer
x = 4 is closest ( The answer can also be 3.6 )